Restructuring Charges Restructuring Accrual Activity (Details) $ in Millions		3 Months Ended	12 Months Ended
		May 02, 2015 USD ($) store	Feb. 03, 2018 USD ($) store	Jan. 28, 2017 USD ($)	Jan. 30, 2016 USD ($)
Restructuring Program Renew Blue Phase 2 [Member] | Employee Severance [Member]
Restructuring Reserve [Roll Forward]
Restructuring reserve, balance at beginning of period			$ 0	$ 0
Charges				19
Cash payments				(17)
Adjustments				(2)
Restructuring reserve, balance at end of period				0	$ 0
Restructuring Program Best Buy Mobile [Member]
Restructuring Cost and Reserve [Line Items]
Number of Stores to be Closed | store			257
Restructuring Program Best Buy Mobile [Member] | Employee Severance [Member]
Restructuring Reserve [Roll Forward]
Restructuring reserve, balance at end of period			$ 8
Restructuring Program Best Buy Mobile [Member] | Facility Closing [Member]
Restructuring Reserve [Roll Forward]
Restructuring reserve, balance at end of period			0
Restructuring Program 2013 Renew Blue [Member] [Domain] | Employee Severance [Member]
Restructuring Reserve [Roll Forward]
Restructuring reserve, balance at end of period			0
Restructuring Program 2013 Renew Blue [Member] [Domain] | Facility Closing [Member]
Restructuring Reserve [Roll Forward]
Restructuring reserve, balance at end of period			11
Restructuring Program Canadian Brand Consolidation [Member]
Restructuring Cost and Reserve [Line Items]
Number of Stores to be Closed | store		66
Number of Future Shop stores converted to Best Buy stores | store		65
Restructuring Reserve [Roll Forward]
Restructuring reserve, balance at beginning of period		$ 0	34	66	0
Charges			0	1	141
Cash payments			(18)	(39)	71
Adjustments	[1]		(2)	2	3
Changes in foreign currency exchange rates			1	4	(7)
Restructuring reserve, balance at end of period			15	34	66
Restructuring Program Canadian Brand Consolidation [Member] | Employee Severance [Member]
Restructuring Reserve [Roll Forward]
Restructuring reserve, balance at beginning of period		0	0	2	0
Charges			0	0	28
Cash payments			0	(2)	24
Adjustments	[1]		0	0	(2)
Changes in foreign currency exchange rates			0	0	0
Restructuring reserve, balance at end of period			0	0	2
Restructuring Program Canadian Brand Consolidation [Member] | Facility Closing [Member]
Restructuring Reserve [Roll Forward]
Restructuring reserve, balance at beginning of period		$ 0	34	64	0
Charges			0	1	113
Cash payments			(18)	(37)	47
Adjustments	[1]		(2)	2	5
Changes in foreign currency exchange rates			1	4	(7)
Restructuring reserve, balance at end of period			$ 15	$ 34	$ 64

[1] djustments related to termination benefits relate to higher-than-expected employee retention. Adjustments related to facility closure and other costs represent changes in sublease assumptions.